kconfig: split preprocessor prototypes into preprocess.h

These are needed only for the parse stage. Move the prototypes into
a separate header to make sure they are not used after that.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/lexer.l

@@ -14,6 +14,8 @@
 #include <string.h>
 
 #include "lkc.h"
+#include "preprocess.h"
+
 #include "parser.tab.h"
 
 #define YY_DECL		static int yylex1(void)

scripts/kconfig/lkc_proto.h

@@ -40,19 +40,6 @@ const char * sym_get_string_value(struct symbol *sym);
 
 const char * prop_get_type_name(enum prop_type type);
 
-/* preprocess.c */
-enum variable_flavor {
-	VAR_SIMPLE,
-	VAR_RECURSIVE,
-	VAR_APPEND,
-};
-void env_write_dep(struct gstr *gs);
-void variable_add(const char *name, const char *value,
-		  enum variable_flavor flavor);
-void variable_all_del(void);
-char *expand_dollar(const char **str);
-char *expand_one_token(const char **str);
-
 /* expr.c */
 void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken);
 

scripts/kconfig/parser.y

@@ -13,6 +13,7 @@
 
 #include "lkc.h"
 #include "internal.h"
+#include "preprocess.h"
 
 #define printd(mask, fmt...) if (cdebug & (mask)) printf(fmt)
 

scripts/kconfig/preprocess.c

@@ -11,6 +11,7 @@
 
 #include "list.h"
 #include "lkc.h"
+#include "preprocess.h"
 
 #define ARRAY_SIZE(arr)		(sizeof(arr) / sizeof((arr)[0]))
 

scripts/kconfig/preprocess.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef PREPROCESS_H
+#define PREPROCESS_H
+
+enum variable_flavor {
+	VAR_SIMPLE,
+	VAR_RECURSIVE,
+	VAR_APPEND,
+};
+
+struct gstr;
+void env_write_dep(struct gstr *gs);
+void variable_add(const char *name, const char *value,
+		  enum variable_flavor flavor);
+void variable_all_del(void);
+char *expand_dollar(const char **str);
+char *expand_one_token(const char **str);
+
+#endif /* PREPROCESS_H */